Ti Tree Gas to Energy Project

Ti Tree Gas to Energy Project is a Landfill Gas (LFG) project located at the Ti Tree Bioenergy Facility in Willowbank, approximately 15km southwest of Ipswich, Queensland. Registered in November 2012, the project operates within a substantial waste management precinct established in a former open-cut coal mine void. The facility is a joint venture involving Veolia and utilizes the mine's estimated 37 million cubic meter capacity to manage waste for the South East Queensland region.

The project operates under the Carbon Credits (Carbon Farming Initiative, Landfill Gas) Methodology Determination 2015. Landfill gas projects involve the installation of gas collection systems, comprising vertical wells and horizontal pipes, to extract methane generated by decomposing organic waste. This captured gas is then combusted, either through flaring or electricity generation, converting high-global-warming-potential methane into carbon dioxide. This specific project transitioned from an earlier "legacy waste" method and accounts for abatement from both legacy (pre-2012) and non-legacy waste streams.

The Willowbank region consists of a mix of heavy industrial land use (including the nearby RAAF Base Amberley and Queensland Raceway) and rural grazing properties. The area experiences a humid subtropical climate with average annual rainfall between 700mm and 900mm, predominantly falling in summer. While the surrounding landscape is characterized by clay-based soils (Vertosols) common to the Ipswich area, the project site itself relies on engineered clay capping and rehabilitated soil profiles to seal the former mine void.

A notable feature of this project is its use of "bioreactor" technology. Unlike traditional "dry tomb" landfills that minimize moisture to slow decomposition, this facility recirculates leachate (wastewater) through the waste mass. This process accelerates biological breakdown and methane production, allowing for more efficient gas capture and renewable energy generation. The site reportedly hosts generation capacity of approximately 4.4 megawatts, feeding electricity into the local grid.